The interaction between the alleles of two or more loci is known as:

Correct option is C

✅ (c) Epistasis: • A genetic interaction where one gene locus masks or modifies the effect of another locus. • It influences phenotypic expression and is important in plant and animal breeding. • Example: Coat color in mice and flower color in sweet peas.
❌ (a) Epidemiology: • The study of disease patterns in populations, not genetic interaction.
❌ (b) Epiphytosis: • Refers to a sudden outbreak of plant disease, not allele interaction.
❌ (d) Dominant: • A type of allele behavior, not an interaction between loci.